M38045FALKP datasheet(39/131 Pages) RENESAS

39 / 131 page

Rev.1.00

Oct 27, 2008

Page 37 of 128

REJ03B0266-0100

3804 Group (Spec.L)

(6) Programmable waveform generating mode

• Mode selection

This mode can be selected by setting “100” to the timer Z

operating mode bits (bits 2 to 0) and setting “0” to the

timer/event counter mode switch bit (b7) of the timer Z mode

• Count source selection

In high- or middle-speed mode, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64,

1/128, 1/256, 1/512 or 1/1024 of f(XIN); or f(XCIN) can be

selected as the count source.

In low-speed mode, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256,

1/512 or 1/1024 of f(XCIN); or f(XCIN) can be selected as the

count source.

• Interrupt

The interrupt at an underflow is the same as the timer mode’s.

• Explanation of operation

The operation is the same as the timer mode’s. Moreover the

timer outputs the data set in the output level latch (bit 4) of the

timer Z mode register (address 002A16) from the CNTR2 pin

each time the timer underflows.

Changing the value of the output level latch and the timer latch

after an underflow makes it possible to output an optional

waveform from the CNTR2 pin.

• Precautions

The double-function port of CNTR2 pin and port P47 is

automatically set to the programmable waveform generating port

in this mode.

Figure 34 shows the timing chart of the programmable waveform

generating mode.

(7) Programmable one-shot generating mode

• Mode selection

This mode can be selected by setting “101” to the timer Z

operating mode bits (bits 2 to 0) and setting “0” to the

timer/event counter mode switch bit (b7) of the timer Z mode

• Count source selection

In high- or middle-speed mode, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64,

1/128, 1/256, 1/512 or 1/1024 of f(XIN); or f(XCIN) can be

selected as the count source.

• Interrupt

The interrupt at an underflow is the same as the timer mode’s.

The trigger to generate one-shot pulse can be selected by the INT1

active edge selection bit (bit 1) of the interrupt edge selection

selected; when it is “1”, the rising edge active is selected.

When the valid edge of the INT1 pin is detected, the INT1

interrupt request bit (bit 1) of the interrupt request register 1

(address 003C16) is set to “1”.

• Explanation of operation

1. “H” one-shot pulse; Bit 5 of timer Z mode register = “0”

The output level of the CNTR2 pin is initialized to “L” at

mode selection. When trigger generation (input signal to

INT1 pin) is detected, “H” is output from the CNTR2 pin.

When an underflow occurs, “L” is output. The “H” one-shot

pulse width is set by the setting value to the timer Z register

low-order and high-order. When trigger generating is

detected during timer count stop, although “H” is output

from the CNTR2 pin, “H” output state continues because an

underflow does not occur.

2. “L” one-shot pulse; Bit 5 of timer Z mode register = “1”

The output level of the CNTR2 pin is initialized to “H” at

mode selection. When trigger generation (input signal to

INT1 pin) is detected, “L” is output from the CNTR2 pin.

When an underflow occurs, “H” is output. The “L” one-shot

pulse width is set by the setting value to the timer Z low-

order and high-order. When trigger generating is detected

during timer count stop, although “L” is output from the

CNTR2 pin, “L” output state continues because an under-

flow does not occur.

• Precautions

Set the double-function port of INT1 pin and port P42 to input in

this mode.

The double-function port of CNTR2 pin and port P47 is

automatically set to the programmable one-shot generating port

in this mode.

This mode cannot be used in low-speed mode.

If the value of the CNTR2 active edge switch bit is changed

during one-shot generating enabled or generating one-shot pulse,

then the output level from CNTR2 pin changes.

Figure 35 shows the timing chart of the programmable one-shot

generating mode.

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